LT3027_15 Datasheet, PDF (1/16 Pages) Linear Technology – Dual 100mA, Low Dropout, Low Noise, Micropower Regulator with Independent Inputs

FEATURES
■ _{Low Noise: 20µVRMS (10Hz to 100kHz)}
■ _{Low Quiescent Current: 25µA/Channel}
■ _{Independent Inputs}
■ _{Wide Input Voltage Range: 1.8V to 20V}
■ _{Output Current: 100mA/Channel}
■ _{Very Low Shutdown Current: <0.1µA}
■ _{Low Dropout Voltage: 300mV at 100mA}
■ _{Adjustable Output from 1.22V to 20V}
■ _{Stable with 1µF Output Capacitor}
■ _{Stable with Aluminum, Tantalum or}
Ceramic Capacitors
■ _{Reverse Battery Protected}
■ _{No Protection Diodes Needed}
■ _{Overcurrent and Overtemperature Protected}
■ _{Tracking/Sequencing Capability}
■ _{Thermally Enhanced 10-Lead MSOP and DFN}
Packages
U
APPLICATIO S
■ _{Cellular Phones}
■ _Pagers
■ _{Battery-Powered Systems}
■ _{Frequency Synthesizers}
■ _{Wireless Modems}
■ _{Tracking/Sequencing Power Supplies}
LT3027
Dual 100mA,
Low Dropout, Low Noise,
Micropower Regulator with
Independent Inputs
DESCRIPTIO
The LT^®3027 is a dual, micropower, low noise, low drop-
out regulator with independent inputs. With an external
0.01µF bypass capacitor, output noise is a low 20µV_RMS
over a 10Hz to 100kHz bandwidth. Designed for use in
battery-powered systems, the low 25µA quiescent current
per channel makes it an ideal choice. In shutdown, quies-
cent current drops to less than 0.1µA. Shutdown control
is independent for each channel, allowing for flexibility in
power management. The device is capable of operating
over an input voltage from 1.8V to 20V, and can supply
100mA of output current from each channel with a drop-
out voltage of 300mV. Quiescent current is well controlled
in dropout.
The LT3027 regulator is stable with output capacitors as
low as 1µF. Small ceramic capacitors can be used without
the series resistance required by other regulators.
Internal protection circuitry includes reverse battery pro-
tection, current limiting and thermal limiting protection.
The device is available as an adjustable device with a
1.22V reference voltage. The LT3027 regulator is available
in the thermally enhanced 10-lead MSOP and low profile
(0.75mm) 3mm × 3mm DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6118263, 6144250.
TYPICAL APPLICATIO
V_IN1
3.7V TO
20V
V_IN2
2.9V TO
20V
3.3V/2.5V Low Noise Regulators
IN1
OUT1
1µF
SHDN1
BYP1
ADJ1
LT3027
IN2
OUT2
1µF
SHDN2
BYP2
ADJ2
GND
0.01µF
422k
3.3V AT 100mA
20µV_RMS NOISE
10µF
249k
0.01µF _261k
2.5V AT 100mA
20µV_RMS NOISE
10µF
249k
3027 TA01
10Hz to 100kHz Output Noise
V_OUT
100µV/DIV
20µV_RMS
3027 TA01b
3027fa
1